05-24-2013, 12:52 PM | #23 | |
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05-24-2013, 01:56 PM | #24 |
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Maybe this is the logic (pure speculation, trying to reconcile the 20:80 thing): perhaps when turning, MSports vector more torque to the rear wheels (up to 80%), while simultaneously braking the inside rear wheel--this would effectively apply more torque to the rear outside wheel at the same time, hence emulating Dynamic Performance Control.
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05-24-2013, 01:59 PM | #25 | |
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My wife could care less, and is honestly better off with more fwd bias, but if BMW gets around to applying this to a sportier car available with a manual, I'd actually consider it for myself. |
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05-25-2013, 03:34 AM | #26 |
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OP any luck identifying the issue?
As I originally said I have the diesel version, which apparently has not enough power to spin the wheels, but probably has about the same torque level particularly at low revs as the 3.5(?). Last time I looked it is torque that turns the wheels and power that gives the speed. Anyway, things I would check are: Tyres, all season seem like a potential problem, don't need them in Aus. Tyre pressure is even and not high or low. Dealer delivered mine with 35 to 40 psi across the four tyres. 18 inch stagered run flats. I run 36 front 37psi rear. Is the problem the same in sport mode. I am not a fan of non sport mode with the throttle lag etc, I drive in sport and love it, no issues with traction control at all, and I accelerate around corners and take off from lights with no issues. No girly driving, x1 faster than big v8's I have had in around town driving. Excess traction control kickin seems odd, maybe a dealer fix required.... |
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05-28-2013, 01:00 AM | #27 | |
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We know that all xDrive models can transfer 100% of power to either axle but only Performance Control provides torque vectoring via DTC braking. |
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05-28-2013, 08:35 AM | #28 |
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On our car the traction control cuts power when I want to accelerate out of corners (no flashing lights) on the dry, so I usually turn it off when I'm attacking corners.
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05-28-2013, 02:16 PM | #29 |
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I understand what you're getting at, but I suppose there is one exception to this (the torque allocation in a straight line) and that is torque steer--at some point theoretically you might encounter torque steer if more than x% torque is sent forward. Probably not an issue for current XDrive BMW's but conceivably an issue for any hypothetical future FWD-based bimmers.
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05-28-2013, 02:25 PM | #30 | |
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05-28-2013, 02:42 PM | #31 | |
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05-28-2013, 02:51 PM | #32 |
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05-28-2013, 04:07 PM | #33 |
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I'd check but my car is back in the hands of BMW for 2-3 months.
While on my ED at the 'ring I used an android app called "Torque" to record telemetry data from the X1's on board diagnostics port. The app is free or $5 for the full version and you can buy a bluetooth OBD adapter for $15-$60 that will probably shed some light on this for you. There are about 50 things you can monitor through the ODB port of an X1 including the accelerator pedal position, the requested power level, the actual power level that the engine is outputting, the requested and actual power level and dozens of other useful stats that will help you figure out if DTC is really cutting your power. |
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06-03-2013, 07:07 PM | #34 |
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I accelerated out of a gas station into heavy traffic recently and my right rear wheel hopped the curb. DTC did not appear to kick in heavily and I was able to accelerate normally and briskly to avoid oncoming traffic. I am very happy with the xDrive in the M Sport so far.
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06-04-2013, 12:21 PM | #35 |
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I've been keeping an eye out for any traction control cutting in and I have to reiterate that there is no issue with it being intrusive on my 35i MSport when driven aggressively
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